The common aim of the Kyoto protocol is that the ratified, industrialized countries must collectively reduce the level of greenhouse gases emissions by 5.2% of the level in 1990. The target year for this protocol is 2012.
The individual targets (reduction percentage) differ by region. For instance,
European Union – 8%
United States – 7%
UK – 12.5%
Japan – 6%
Some members are permitted to increase the level of greenhouse gases emission. For instance, Iceland can increase by 10% and Portugal by 27%.